Combined filter unit and coupling element



FIG. 1 is a perspective view of a combined filter unit and coupling element showing our new design, on a greatly enlarged scale;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof, the other side being identical;

FIG. 4 is a top plan view thereof, on an enlarged scale;

FIG. 5 is a bottom plan view thereof, on an enlarged scale. 

The ornamental design for combined filter unit and coupling element, as shown and described. 